/* * $Id: PRStream.java,v 1.12 2002/06/20 13:30:25 blowagie Exp $ * $Name: $ * * Copyright 2001, 2002 by Paulo Soares. * * * The Original Code is 'iText, a free JAVA-PDF library'. * * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie. * All Rights Reserved. * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved. * * Contributor(s): all the names of the contributors are added in the source code * where applicable. * * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. * * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. * * * If you didn't download this code from the following link, you should check if * you aren't using an obsolete version: * http://www.lowagie.com/iText/ */ package pdftk.com.lowagie.text.pdf; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.zip.Deflater; import java.util.zip.DeflaterOutputStream; import java.util.ArrayList; // ssteward import pdftk.com.lowagie.text.Document; import pdftk.com.lowagie.text.ExceptionConverter; public class PRStream extends PdfStream { protected PdfReader reader = null; protected int offset = 0; protected int length = 0; //added by ujihara for decryption protected int objNum = 0; protected int objGen = 0; public PRStream(PRStream stream, PdfDictionary newDic) { reader = stream.reader; offset = stream.offset; length = stream.length; compressed = stream.compressed; compressionLevel = stream.compressionLevel; streamBytes = stream.streamBytes; bytes = stream.bytes; objNum = stream.objNum; objGen = stream.objGen; if (newDic != null) putAll(newDic); else hashMap.putAll(stream.hashMap); } public PRStream(PRStream stream, PdfDictionary newDic, PdfReader reader) { this(stream, newDic); this.reader = reader; } public PRStream(PdfReader reader, int offset) { this.reader = reader; this.offset = offset; } public PRStream(PdfReader reader, byte conts[]) { this(reader, conts, DEFAULT_COMPRESSION); } /** * Creates a new PDF stream object that will replace a stream * in a existing PDF file. * @param reader the reader that holds the existing PDF * @param conts the new content * @param compressionLevel the compression level for the content * @since 2.1.3 (replacing the existing constructor without param compressionLevel) */ public PRStream(PdfReader reader, byte[] conts, int compressionLevel) { this.reader = reader; this.offset = -1; if (Document.compress) { try { ByteArrayOutputStream stream = new ByteArrayOutputStream(); Deflater deflater = new Deflater(compressionLevel); DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater); zip.write(conts); zip.close(); deflater.end(); bytes = stream.toByteArray(); } catch (IOException ioe) { throw new ExceptionConverter(ioe); } put(PdfName.FILTER, PdfName.FLATEDECODE); } else bytes = conts; setLength(bytes.length); } /** * Sets the data associated with the stream, either compressed or * uncompressed. Note that the data will never be compressed if * Document.compress is set to false. * * @param data raw data, decrypted and uncompressed. * @param compress true if you want the stream to be compressed. * @since iText 2.1.1 */ public void setData(byte[] data, boolean compress) { setData(data, compress, DEFAULT_COMPRESSION); } /** * Sets the data associated with the stream, either compressed or * uncompressed. Note that the data will never be compressed if * Document.compress is set to false. * * @param data raw data, decrypted and uncompressed. * @param compress true if you want the stream to be compressed. * @param compressionLevel a value between -1 and 9 (ignored if compress == false) * @since iText 2.1.3 */ public void setData(byte[] data, boolean compress, int compressionLevel) { remove(PdfName.FILTER); remove(PdfName.DECODEPARMS); // ssteward, pdftk 1.46 this.offset = -1; if (Document.compress && compress) { try { ByteArrayOutputStream stream = new ByteArrayOutputStream(); Deflater deflater = new Deflater(compressionLevel); DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater); zip.write(data); zip.close(); deflater.end(); bytes = stream.toByteArray(); this.compressionLevel = compressionLevel; } catch (IOException ioe) { throw new ExceptionConverter(ioe); } put(PdfName.FILTER, PdfName.FLATEDECODE); } else bytes = data; setLength(bytes.length); } /**Sets the data associated with the stream * @param data raw data, decrypted and uncompressed. */ public void setData(byte[] data) { setData(data, true); } public void setLength(int length) { this.length = length; put(PdfName.LENGTH, new PdfNumber(length)); } public int getOffset() { return offset; } public int getLength() { return length; } public PdfReader getReader() { return reader; } public byte[] getBytes() { return bytes; } public void setObjNum(int objNum, int objGen) { this.objNum = objNum; this.objGen = objGen; } int getObjNum() { return objNum; } int getObjGen() { return objGen; } // ssteward: added code to perform uncompression (filtering) or compression of streams public void toPdf(PdfWriter writer, OutputStream os) throws IOException { // 4.2.0 byte[] b= new byte[0]; if( ( writer.filterStreams || writer.compressStreams ) && filtersAreKnown() ) { // ssteward setData( PdfReader.getStreamBytes( this ), // apply filters to yield clear text writer.compressStreams, DEFAULT_COMPRESSION ); b= bytes; } else { // use temp b= PdfReader.getStreamBytesRaw( this ); } PdfEncryption crypto = null; if (writer != null) crypto = writer.getEncryption(); PdfObject objLen = get(PdfName.LENGTH); int nn = b.length; if (crypto != null) nn = crypto.calculateStreamSize(nn); put(PdfName.LENGTH, new PdfNumber(nn)); superToPdf(writer, os); put(PdfName.LENGTH, objLen); os.write(STARTSTREAM); if (length > 0) { if (crypto != null && !crypto.isEmbeddedFilesOnly()) b = crypto.encryptByteArray(b); os.write(b); } os.write(ENDSTREAM); } // ssteward // do we know how to apply all of the stream filters? public boolean filtersAreKnown() { boolean retVal= true; PdfObject filter = PdfReader.getPdfObjectRelease(get(PdfName.FILTER)); ArrayList filters = new ArrayList(); if (filter != null) { if (filter.isName()) filters.add(filter); else if (filter.isArray()) filters = ((PdfArray)filter).getArrayList(); } String name; for (int j = 0; j < filters.size(); ++j) { name = ((PdfName)PdfReader.getPdfObjectRelease ((PdfObject)filters.get(j))).toString(); retVal = retVal && ( (name.equals("/FlateDecode") || name.equals("/Fl")) || (name.equals("/ASCIIHexDecode") || name.equals("/AHx")) || (name.equals("/ASCII85Decode") || name.equals("/A85")) || (name.equals("/LZWDecode")) ); } return retVal; } }